It reveals that the perovskite phase of jd material decreases with increasing sintering time . the sintering time has no effect on the phase structure of ty ferrite . the grain size of both jd ferroelectrics and ty ferrite increases with increasing sintering time 研究了900下保温时间对jd材料和ty材料相结构的影响，结果表明随着保温时间的延长，介电材料中焦绿石相含量增加，钙钛矿相含量减少；而保温时间对铁氧体材料的相结构无影响；此外，两种材料的晶粒尺寸均随着保温时间的延长而增加，最佳保温时间为2h 。
In this paper , the application and research status of magnetic materials , the development distinctions of magnetic industry between china and foreign country , the development strategies of hard ferrite , and the advantages and significance for developing magnetic industry in panzhiahua district was introduced 本文介绍了磁性材料特别是永磁铁氧体材料的国内外发展现状、研发现状；中国永磁铁氧体产业与国外的差距，发展永磁铁氧体的跨世纪对策及攀枝花发展磁性材料产业的优势和意义。
The basic technique to achieve the target is that raising the frequency of the power supply , mainly of dc - dc converter . there are several key techniques by which we carry out the high frequency of the dc - dc converter . they are high frequency and low loss ferrite technique , design - optimization of the high frequency transformer and circuit technique , and install of dc - dc converter technique 当前实现开关电源高频化这一目标的关键技术,有采用铁氧体材料研制dc - dc变换器技术,高频变压器的优化设计,电路的优化设计,高频dc - dc变换器的制作与安装等技术。
In order to make use of labor power , material resources , financial resources , financial resources and natural resources in the panzhihua iron and steel company , to develop the district of high - grade magnetic material and establish magnetic material industry production base in the west region of china , this paper focus on the study of the application technology of hard ferrite pre - sintering material with high - quality 为充分利用攀钢现有人力、物力、财力及得天独厚的自然资源优势，发展地区高档磁性材料产业，建设中国西部磁性材料产业基地，本文对高档永磁铁氧体预烧料制备应用技术进行了研究。永磁铁氧体特别是高性能永磁铁氧体材料是当代社会及其发展的基础功能材料。
